Honoring ETag of cached content

[Marc Aymerich]

Hi,
I'm using nginx proxy pass to cache content of our dynamic web application.

In order to save some bandwidth our client application uses conditional
requests based on ETag. However nginx ignores the ETag of cached pages :(

What would be required if I want to honor the ETag of cached pages? Is
something that can be achieve by means of configuration? or I would need to
write an nginx module in C?

Thanks!

-- 
Marc
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